Research and industrialization progress of recovering alumina from fly ash: A concise review

Ding, Jian; Ma, Shuhua; Shen, Shirley; Xie, Zongli; Zheng, Shili; Zhang, Yi

doi:10.1016/j.wasman.2016.06.009

Cited by 177 publications

(54 citation statements)

References 59 publications

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“…Coal fly ash contains up to 30% aluminum oxide, making this type of raw material an attractive alternative to bauxites for alumina production [3][4][5][6]. High content of silicon dioxide in ash makes it impossible to use standard alkaline technologies because of significant losses of sodium hydroxide at the processing stage of coal fly ash leaching [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

Valeev

Михайлова

Atmadzhidi

2018

Metals

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Iron contained in coal fly ash of the Ekibastuz power station is distributed between magnetite and hematite. XRD data showed that~80 wt % of iron is contained in magnetite and 20 wt % in hematite. The leaching of iron from CFA by HCl was studied. It was determined that leaching efficiency increased with the increase in hydrochloric acid concentration and temperature. The maximum iron extraction efficiency was 52%. Aluminum is contained in the mullite and was practically not leached. The maximum aluminum extraction efficiency was 3.7%. The kinetics investigation showed that the process of iron leaching was controlled by chemical reaction and diffusion process steps, with an activation energy of 33.25 kJ•mol −1. The aluminum leaching process is controlled by a diffusion process step with an activation energy of 19.89 kJ•mol −1. The reaction order of hydrochloric acid is determined to be 0.9 and 0.23 for iron and aluminum, respectively.

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Section: Introductionmentioning

confidence: 99%

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

Valeev

Михайлова

Atmadzhidi

2018

Metals

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“…CFB ash (1, 6, 7, 10) mainly contained anhydrite, quartz, periclase, natrite, CaCO 3 , muscovite, and hematite (6,7). In addition, albite (1), microcline (6), and iron oxide (1,10) were also present.…”

Section: Mineralogical Composition Of the Fly Ashmentioning

confidence: 99%

“…3 258 000 tons of fly ash were generated in Poland in 2016, of which 86.7% were subjected to recovery and 11.3% were disposed of, including 2% of fly ash that were temporarily stored, while 26 000 000 tons of fly ash were accumulated as landfilled waste [1]. The most important areas of fly ash application are: concrete production [2], cement clinkers [3], foam glass [4], glass ceramics [5], glass [6], ceramics [7], soil amelioration [8], mine reclamation [9], alumina recovery [10], road basement material [11], geopolymer [12], adsorbents [13][14][15][16][17][18][19][20][21][22], zeolites [23][24][25][26], and mesoporous molecular sieve [27][28].…”

mentioning

confidence: 99%

Characterization of Fly Ash from Polish Coal-Fired CHP Plants for NO2 Capture

Ściubidło¹,

Majchrzak‐Kucęba²,

Nowak³

2019

Pol. J. Environ. Stud.

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Fossil fuels will be perspective until 2030 to satisfy the demand of about four-fifths of the energy consumption in the world. Coal reserves are available for about 200 years, oil for 35-40 years and natural gas for about 40-50. Coal, due to its high emissivity, is a risk for the environment. In addition, coal is the main fuel for the production of electrical energy, which is why it requires a more environmentally friendly method of fuel conversion. In Poland, the production of electricity is based mainly on coal. According to the GUS (Central Statistical Office), primary energy consumption in Poland in 2016 was 4 448 025 TJ, of which 39.84% was generated from the combustion of hard coal and 11.02% from lignite. Based on the statistical data,

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“…In order to utilize the special high-alumina fly ash produced in the north of China, several methods including limestone sintering process, pre-desilication and lime-soda sintering process, hydro-chemical process, acid process and ammonium sulphate sintering process, etc. have been proposed [6]- [8]. All of these technologies emphasize particularly on the alumina extraction, and they can yet solve the silica synchronous utilization, as easily leading to a second pollution and poor economic benefit.…”

Section: B a Brief Description Of Cfa Utilizationmentioning

confidence: 99%

Challenges and Developments in the Utilization of Fly Ash in China

Ma¹,

Xu²,

Qiqige³

et al. 2017

IJESD

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Abstract-China's coal-fired power plants produce about 600 million tons fly ash annually, which has caused severe economic and environmental problems. This paper first describes briefly the production and utilization status of coal fly ash in China. Then it analyzes the main challenges to the fly ash utilization in China due to the conflict between the huge amount production of fly ash and the depressed consumption of fly ash, as well as the increasing driving forces in the environmental protection. Subsequently, the new developments of fly ash utilization in China, including valuable elements extraction, geopolymer production, fly ash-based ceramics synthesis and soil desertification control are introduced in detail.

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Research and industrialization progress of recovering alumina from fly ash: A concise review

Cited by 177 publications

References 59 publications

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

Characterization of Fly Ash from Polish Coal-Fired CHP Plants for NO2 Capture

Challenges and Developments in the Utilization of Fly Ash in China

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